221180418 has 12 divisors (see below), whose sum is σ = 479224278. Its totient is φ = 73726800.

The previous prime is 221180411. The next prime is 221180423. The reversal of 221180418 is 814081122.

It can be written as a sum of positive squares in only one way, i.e., 197880489 + 23299929 = 14067^2 + 4827^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221180391 and 221180400.

It is not an unprimeable number, because it can be changed into a prime (221180411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6143883 + ... + 6143918.

Almost surely, 2^221180418 is an apocalyptic number.

221180418 is an abundant number, since it is smaller than the sum of its proper divisors (258043860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221180418 is a wasteful number, since it uses less digits than its factorization.

221180418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12287809 (or 12287806 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 221180418 is about 14872.1356233730. The cubic root of 221180418 is about 604.7588392927.

The spelling of 221180418 in words is "two hundred twenty-one million, one hundred eighty thousand, four hundred eighteen".